It will not engrave in a straight line.
i ran into that once with my model manual new hermes & it was a
loose connection at one of the 'elbows' that carried the diamond
point/stylus to the templates. if you have a manual model it could
also be a loose stylus or the set bolts that hold the templates onto
the adjustable table - or it could be that some evil creature, for
lack of something better to do with its time, has placed a curse on
the engraver. try one of the mechanical remedies or call in an
exorcist; some repairmen are not as capable as a good exorcist.
unfortunately i don't have the name of the one my former spouse used
not long after i 'left spouse & home' when, early one morning, the
billiards table down in the playroom moved several inches across the
good luck -
who wouldn't have wasted energy on a billiards table -